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Hybrid vehicle drive control device

Active Publication Date: 2015-02-26
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a drive control device for a hybrid vehicle that reduces the generation of noise during operation of the engine. The invention includes a first differential mechanism and a second differential mechanism, as well as an engine, electric motors, and an output rotary member that are connected to these elements. One of the rotary elements of the first and second differential mechanisms is fixed to a stationary member through a brake. The invention is characterized by controlling the electric motors to generate reaction torques while controlling the ratio of these torches to reduce noise. Additionally, the invention includes a clutch that selectively connects the rotary elements of the first and second differential mechanisms, allowing for control of the torque generated by each electric motor and prevention of noise. Overall, the invention prevents excessive noise during hybrid drive modes and provides a more practical and comfortable driving experience.

Problems solved by technology

According to the conventional arrangement of the hybrid vehicle described above, however, a mechanism such as a planetary gear set connected to the above-described electric motor may generate a noise during running of the hybrid vehicle in a hybrid drive mode in which the above-described engine is operated.
Namely, when an output torque of the electric motor is excessively small, gears in the mechanism are held in meshing engagement with each other with small forces, so that the gears may generate a butting noise due to a variation of an output torque of the engine.
However, these solutions result in other problems such as deterioration of fuel economy or an increase of weight and cost of manufacture of the hybrid vehicle.

Method used

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Examples

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first embodiment

[0036]FIG. 1 is the schematic view for explaining an arrangement of a hybrid vehicle drive system 10 (hereinafter referred to simply as a “drive system 10”) to which the present invention is suitably applicable. As shown in FIG. 1, the drive system 10 according to the present embodiment is of a transversely installed type suitably used for an FF (front-engine front-drive) type vehicle, and is provided with a main vehicle drive power source in the form of an engine 12, a first electric motor MG1, a second electric motor MG2, a first differential mechanism in the form of a first planetary gear set 14, and a second differential mechanism in the form of a second planetary gear set 16, which are disposed on a common center axis CE. The drive system 10 is constructed substantially symmetrically with respect to the center axis CE. In FIG. 1, a lower half of the drive system 10 is not shown. This description applies to other embodiments which will be described.

[0037]The engine 12 is an inte...

second embodiment

[0076]FIGS. 12-17 are the schematic views for explaining arrangements of hybrid vehicle drive systems 100, 110, 120, 130, 140 and 150 according to another preferred embodiment of this invention. The present invention is equally applicable to the drive system 100 shown in FIG. 12 and the drive system 110 shown in FIG. 13, which have respective different orders of arrangement (position) of the first electric motor MG1, first planetary gear set 14, second electric motor MG2, second planetary gear set 16, clutch CL and brake BK, in the direction of the center axis CE. The prevent invention is also equally applicable to the drive system 120 shown in FIG. 14, wherein a one-way clutch OWC is disposed in parallel with the brake BK, between the carrier C2 of the second planetary gear set 16 and the stationary member in the form of the housing 26, such that the one-way clutch OWC permits a rotary motion of the carrier C2 relative to the housing 26 in one of opposite directions, and inhibits a...

third embodiment

[0077]FIGS. 18-20 are the collinear charts for explaining arrangements and operations of respective hybrid vehicle drive systems 160, 170 and 180 according to other preferred embodiments of this invention in place of the drive system 10. In FIGS. 18-20, the relative rotating speeds of the sun gear S1, carrier C1 and ring gear R1 of the first planetary gear set 14 are represented by the solid line L1, while the relative rotating speeds of the sun gear S2, carrier C2 and ring gear R2 of the second planetary gear set 16 are represented by the broken line L2, as in FIGS. 4-7. In the drive system 160 for the hybrid vehicle shown in FIG. 18, the sun gear S1, carrier C1 and ring gear R1 of the first planetary gear set 14 are respectively connected to the first electric motor MG1, engine 12 and second electric motor MG2, while the sun gear S2, carrier C2 and ring gear R2 of the second planetary gear set 16 are respectively connected to the second electric motor MG2 and output gear 30, and t...

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Abstract

A drive control device for a hybrid vehicle is provided with a differential device including four rotary elements; and an engine, first and second electric motors and an output rotary member which are respectively connected to the four rotary elements. One of the four rotary elements is constituted by a rotary component of a first differential mechanism and a rotary component of a second differential mechanism selectively connected through a clutch, and one of the rotary components is selectively fixed to a stationary member through a brake. The drive control device comprises an electric motor operation control portion configured to control the first and second electric motors to generate reaction torques in a drive mode of the hybrid vehicle in which the engine is operated in an engaged state of the clutch and in a released state of the brake; and a torque assignment ratio control portion configured to control a ratio of the reaction torques to be generated by the first and second electric motors, without a change of a drive force for driving the hybrid vehicle.

Description

TECHNICAL FIELD[0001]The present invention relates to an improvement of a drive control device for a hybrid vehicle.BACKGROUND ART[0002]There is known a hybrid vehicle which has at least one electric motor in addition to an engine such as an internal combustion engine, which functions as a vehicle drive power source. Patent Document 1 discloses an example of such a hybrid vehicle, which is provided with an internal combustion engine, a first electric motor and a second electric motor. This hybrid vehicle is further provided with a brake which is configured to fix an output shaft of the above-described internal combustion engine to a stationary member, and an operating state of which is controlled according to a running condition of the hybrid vehicle, so as to improve energy efficiency of the hybrid vehicle and to permit the hybrid vehicle to run according to a requirement by an operator of the hybrid vehicle.PRIOR ART DOCUMENTSPatent Documents[0003]Patent Document 1: JP-2008-265600...

Claims

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Application Information

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IPC IPC(8): B60W20/00B60W10/02B60W10/196B60W10/08
CPCB60W20/10B60W10/08Y10S903/93B60W10/196B60W10/02B60W20/17B60K6/387B60K6/445B60W10/18B60W2710/08B60W2710/18B60W2710/021B60K2006/381B60W10/06B60W30/1843B60W2510/087Y02T10/62
Inventor SATO, DAIKISHIIBA, KAZUYUKI
Owner TOYOTA JIDOSHA KK
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